﻿using System;
using System.Collections.Generic;
using System.Text;

namespace C
{
    class Class1
    {
        public  Class1(double a)
        {
            double b = a*a*3.14;
            Console.WriteLine("结果为：{0}",b);
        }

        public  Class1(double  a,double b)
        {
            double c = a * b;
            Console.WriteLine("结果为：{0}", c);
        }
    }
}
